Refactor Bigfoot files layout + Create our three graphics libraries

Bigfoot/Libs/Engine/BigFile/BigFileSchema.sql

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+PRAGMA journal_mode=WAL;
+
+CREATE TABLE IF NOT EXISTS AssetMetadata (
+    UUID                BLOB        NOT NULL,
+
+    CreateTime          INTEGER     NOT NULL DEFAULT(CAST(unixepoch('subsec') * 1000000 AS INTEGER)),
+    ModificationTime    INTEGER     NOT NULL DEFAULT(CAST(unixepoch('subsec') * 1000000 AS INTEGER)),
+
+    PRIMARY KEY(UUID)
+) WITHOUT ROWID;
+
+CREATE TABLE IF NOT EXISTS Asset (
+    UUID                BLOB        NOT NULL,
+
+    Asset               BLOB        NOT NULL,
+
+    PRIMARY KEY(UUID),
+    FOREIGN KEY(UUID) REFERENCES AssetMetadata(UUID) ON DELETE CASCADE
+) WITHOUT ROWID;
+
+CREATE TRIGGER IF NOT EXISTS Asset_UpdateTime
+AFTER UPDATE OF Asset ON Asset FOR EACH ROW
+BEGIN
+    UPDATE AssetMetadata
+    SET ModificationTime = CAST(unixepoch('subsec') * 1000000 AS INTEGER)
+    WHERE UUID = NEW.UUID;
+END;
+
+CREATE TABLE IF NOT EXISTS AssetHardReference (
+    UUID                BLOB        NOT NULL,
+    HardReference       BLOB        NOT NULL,
+
+    PRIMARY KEY(UUID, HardReference),
+    FOREIGN KEY(UUID) REFERENCES AssetMetadata(UUID)
+        ON DELETE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS AssetHardReference_ReferencedUUID ON AssetHardReference(HardReference);